we have a similar game here in New Zealand called Tag'O'Rama. there is one in every city and there is a country wide one that is only for the die hards.
the local one in my city is Welly TAG O RAMA.
EDIT....
CREDIT TO ADV RIDERS GARDEN STATE TAG O RAMA
Rules are easy...
#1 - Find the tag and reproduce the photo (as best as possible). The first person to
post a found tag gets to place the next tag. If you get a tag, but somebody else posts their picture first, you lose.
#2 - Take the tag to a new location(
location to remain in "host area"), get the photo and post it here. Give a few hints so the next person can figure out where the tag is located. Try to place the tags in interesting locations, maybe a bit of history that can be found down some nice twisties.
#3 - Tag must be a) findable and b) may be placed on a dirt road if a street bike can make it. Maintained gravel is OK, but make sure to let folks know that gravel is required to get to your tag. We don't want to exclude those who don't like to get dirty.
#4 - File photos are NOT permitted. You gotta ride to play this game.
#5 - Your bike has to be in the TAG picture
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I played this game religiously rain or shine any time of the day or night, until my son Orlando was born.